Good stuff ... one thing that would be really, really nice is the ability to see the referer that is linking to 404 pages ... especially for internal linkage. Google already knows this, but would provide a benefit to the webmaster to fix broken links.
Yea, I already use some link checking script ... but figured it would be nice if Google would tell us where things are broken. Major bonus points if they tell us external referers.
Thanks for the tip! Just took a look, but im confused by exactly what these % columns actually means.